From: John Maclean <jayeola@...>
Date: 2008-06-02T21:31:12+09:00
Subject: Re: Usin net/ssh library

On Mon, 2 Jun 2008 21:11:05 +0900
Prasad Pednekar <prasadp@gslab.com> wrote:

> John Maclean wrote:
> > On Sun, 1 Jun 2008 18:23:25 +0900
> > Prasad Pednekar <prasadp@gslab.com> wrote:
> > 
> >> but
> >> in my case after running the script it goes directly to the shell prompt
> >> "$" by-passing the cli prompt.
> >> 
> >> a. Why does this behaviour take place??
> >> 
> >> b. Is there a way to go to the initial cli prompt ??
> >> 
> >> 
> >> -P
> > 
> > From `ri Net::SSH`
> > 
> >        Net::SSH.start("host", "user", :password => "password") do |ssh|
> >          result = ssh.exec!("ls -l")
> >          puts result
> >        end
> > 
> > 
> > Sample of my own stuff...
> > require 'rubygems'
> > require 'net/ssh'
> > 
> > server = "acid"
> > user = "jayeola"
> > Net::SSH.start(server, user) do |x|
> >   cmd2 = x.exec!("test -d /proc && echo \"OK\"").strip
> >   p cmd2
> >   if cmd2 != "OK"
> >     p "no proc found"
> >   else
> >     p "got proc"
> >   end
> > 
> >   cmd3 = x.exec!("test -f /proc/partitions && echo \"OK\"")
> >   cmd4 = x.exec!("test -f /proc/diskstats && echo \"OK\"")
> > end
> > 
> > 
> > I'm using this library and it doesn't give me a prompt at all but runs
> > the code as required. How are you using it?
> 
> 
> Hi John,
>          I am using it the same way as you are using. The problem lies 
> when the initial prompt that is needed gets by-passed when I use the 
> net/ssh module. I have been usng the net/telnet module initially, where 
> I get the appropriate prompt on logging in. ie. ">>>". and the shell 
> prompt is "$" which arises when i do a "!" on the initial prompt.
> 
> Telnet works fine, but i am exercising the usage of connecting to the 
> box thru ssh. So here it by-passes the initial prompt which telnet 
> module does not.
> 
> As telnet looks for a given prompt while logging in, does ssh have such 
> a prompt?
> 
> Also I guess the net/ssh module in ruby creates a instance of the shell 
> and executed the commands to be executed on that shell rather than 
> connecting to the actual machine.
> 
> - P
> 


session.exec!("some command") runs that command on the remote server. You'll have to use another method to gain a shell session. Have a look at `ri Net::SSH` or use `gem_server` and fire up a browser with localhost:8808, (geddit ?). There __is__ a way to get a shell but I've forgotten what it is. Perhaps the gem termios?